Design Two Email Templates - One in Mailchimp, One in HTML (Different E-Mails)

We are moving to Mailchimp from Campaign Monitor and would like a new launch template email designed which is more in line with the branding on our website whilst also still incorporating the elements we currently use in Campaign Monitor.

The template needs to be easy to edit for our administrators without the formatting going awry. Example within this link but looking for design to better match website and probably a bit lighter; http://createsend.com/t/t-A03D5D48D819DF442540EF23F30FEDED

Second email just needs updating with a more responsive design. Existing HTML Code uploaded.